MAX6947ATE+T【PDF 17/24 页】IC LED DRIVER LINEAR 16-TQFN

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10-Port, Constant-Current LED Driver and

I/O Expander with PWM Intensity Control

Table 10. MAX6946/MAX6947 Slave

Addresses

SDA

MAX6947

SLAVE ADDRESS

AD0 = GND

010 0000

SCL

S

P

AD0 = V DD

MAX6946

010 0100

010 0000

START

CONDITION

STOP

CONDITION

Start and Stop Conditions

Both SCL and SDA remain high when the interface is

not busy. A master signals the beginning of a transmis-

sion with a START (S) condition by transitioning SDA

from high to low while SCL is high. When the master fin-

ishes communicating with the slave, it issues a STOP

(P) condition by transitioning SDA from low to high

while SCL is high. The bus is then free for another

transmission (Figure 9).

Bit Transfer

One data bit is transferred during each clock pulse.

The data on SDA must remain stable while SCL is high

(Figure 10).

Acknowledge

Figure 9. Start and Stop Conditions

SDA

SCL

DATA LINE STABLE; CHANGE OF DATA

DATA VALID ALLOWED

Figure 10. Bit Transfer

Any bytes received after the command byte are data

bytes. The first data byte goes into the internal register

of the MAX6946/MAX6947 selected by the command

START

CONDITION

CLOCK PULSE

FOR ACKNOWLEDGE

byte (Figure 11). If multiple data bytes are transmitted

SCL

1

2

8

9

before a STOP condition is detected, these bytes are

generally stored in subsequent MAX6946/MAX6947

SDA BY

TRANSMITTER

internal registers because the command byte autoin-

crements (Table 1).

SDA BY

RECEIVER

S

Message Format for Reading

Read from the MAX6946/MAX6947 using the

MAX6946/MAX6947s’ internally stored command byte

as an address pointer the same way the stored com-

mand byte is used as an address pointer for a write.

The pointer autoincrements after each data byte is read

using the same rules as for a write (Table 1). Thus, a

read is initiated by first configuring the MAX6946/

MAX6947s ’ command byte by performing a write

(Figures 12 and 13). The master can now read n con-

Figure 11. Acknowledge

secutive bytes from the MAX6946/MAX6947 with the

first data byte being read from the register addressed

by the initialized command byte (Figure 14). When per-

forming read-after-write verification, remember to reset

the command byte’s address because the stored com-

mand byte address has been autoincremented after

the write (Table 1).

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